Ichnofossils

Cruziana d’Orbigny, 1842

Taxon description

Gibb et al., 2009

Diagnosis. An elongate, bilobate furrow that can vary in depth with respect to the bedding plane, may be straight and/or gently curved (not tightly or sharply) within or upon the bedding surface, and may be composed of repetitive sets (or series) of imprints (ridges) along its length (though in most cases these ridges cannot be differentiated into distinctive set patterns); ridges in central part of furrow usually aligned in a herringbone shape and more or less continuous along length of furrow; also, sometimes, outside herringbone-aligned ridges, the trace may exhibit pair of narrow, comparatively smooth outer zones with or without fine brush-like impressions, and additionally there may be presence of lateral ridges.

Keighley & Pickerill, 1996

Diagnosis: Elongate (length:width ratio >2:1), typically ribbon-like, bilobate (rarely unilobate) interface burrows or trails preserved as furrows with median ridgesmwhen preserved in concave epirelief (or bilobate trails with median groove when preserved in counterpart convex hyporelief), or paired furrows that are in close proximity (less than the width of a furrow apart). Furrows covered by herring-bone-shaped or transverse striations, with or without smooth or longitudinally striate zones peripheral to the inner striations, with or without outer lateral ridges and/or wisplike markings if preserved on bedding soles (after Fillion and Pickerill, 1990)

Selection of related publications
Vinn, O., Toom, U. 2016. Rare arthropod traces from the Ordovician and Silurian of Estonia (Baltica). Neues Jahrbuch für Geologie und Paläontologie. Abhandlungen 280, 2, 135-141. DOI:10.1127/njgpa/2016/0570
Vinn, O. 2014. Cruziana traces from the Late Silurian (Pridoli) carbonate shelf of Saaremaa, Estonia. Estonian Journal of Earth Sciences 63, 2, 71-75. DOI:10.3176/earth.2014.06
Mikuláš, R., Meškis, S., Ivanov, A., Lukševičs, E., Zupinš, I., Stinkulis, G. 2013. A rich ichnofossil assemblage from the Frasnian (Upper Devonian) deposits at Andoma Hill, Onega Lake, Russia. Bulletin of Geosciences 88, 2, 389-400. DOI:10.3140/bull.geosci.1358
Davies, N. S., Sansom, I. J., Turner, P. 2006. Trace fossils and paleoenvironments of a Late Silurian marginal-marine/alluvial system: the Ringerike Group (Lower Old Red Sandstone), Oslo Region, Norway. Palaios 21, 1, 46-62. DOI:10.2110/palo.2003.p03-08
Knaust, D. 2004. Cambro-Ordovician trace fossils from the SW-Norwegian Caledonides. Geological Journal 39, 1, 1-24. DOI:10.1002/gj.941
Jensen, S. 1997. Trace fossils from the Lower Cambrian Mickwitzia sandstone, south-central Sweden. Fossils and Strata 42, 1-110.
Orłowski, S. 1992. Trilobite trace fossils and their stratigraphical significance in the Cambrian sequence of the Holy Cross Mountains, Poland. Geological Journal 27, 1, 15-34. DOI:10.1002/gj.3350270104